Hello, I have a similar problem with the purchase module, after confirming a purchase order if I want to send by email, I get this error, I have not made modifications on the module or translations.

Could help me see what the error is?

odoo.addons.mail.models.mail_template: Failed to load template u'\n<p style="margin:0px 0px 9px 0px;">Hola ${object.partner_id.name} \n% if object.partner_id.parent_id:\n    (<i>${object.partner_id.parent_id.name}</i>)\n% endif\n,</p>\n<p style="margin:0px 0px 9px 0px;">\nAdjunto le remito la <strong style="font-weight:bold;">${object.state in (\'draft\', \'sent\') and \'solicitud de presupuesto\' or \'confirmaci\xf3n de pedido de compra} ${object.name}</strong>\n% if object.partner_ref:\n    con su referencia: ${object.partner_ref}\n% endif\n% if object.origin:\n    (referencia de pedido: ${object.origin})\n% endif\nTotal del pedido <strong style="font-weight:bold;">${object.amount_total} ${object.currency_id.name}</strong>\nde ${object.company_id.name}.\n</p>\n\n<p style="margin:0px 0px 9px 0px;">Si tiene alguna duda, puede responder este email.</p>\n<p style="margin:0px 0px 9px 0px;">Gracias,</p>\n'
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/odoo/addons/mail/models/mail_template.py", line 374, in render_template
    template = mako_env.from_string(tools.ustr(template_txt))
  File "/usr/lib/python2.7/site-packages/jinja2/environment.py", line 841, in from_string
    return cls.from_code(self, self.compile(source), globals, None)
  File "/usr/lib/python2.7/site-packages/jinja2/environment.py", line 554, in compile
    self.handle_exception(exc_info, source_hint=source)
  File "/usr/lib/python2.7/site-packages/jinja2/environment.py", line 742, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "<unknown>", line 8, in template
TemplateSyntaxError: unexpected char u"'" at 326

I think it is a bug of Odoo, because I made a new configuration, only installing the module and sending the order and confirming generates the error. I'm using odoo 10

You need to "un-translate" the template.

Settings > Email > Templates > search for "Reminder to User" template and open it > Edit > on the Subject field hit the blue translation button > in the Russian Translation Value change this (note the word in bold ):

Напоминание о кандидате: ${object.id} from ${object.partner_id != False и object.partner_id.name or object.contact_name}

to this:

Напоминание о кандидате: ${object.id} from ${object.partner_id != False and object.partner_id.name or object.contact_name}

This should solve the issue, although I haven't tried it myself.